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A VTY is your virtual terminal for use when you telnet into the router=2E 0 is the first VTY that the router uses and the first location that will answer a telnet session if no other sessions are established (unless you specify a terminal number you want to telnet to)=2E

You can execute a 'show line' command to see the configuration of the available VTYs, Console, Async, and Aux ports configured for your router=2E

I don't know what you mean by "what effect will it give if changed=2E" If you mean, "If you configure it, what will happen?" well, that depends on what you configure it to do=2E If you put an access list on it with a deny ip any any, then no one will be able to connect to that VTY=2E If you set a login command on it without a password, then no one will be able to log onto it, etc=2E

What this does is configure five VTY interfaces that people can ssh into
(versus telnet). It allows login using the password of whatever, but
restricts the users that connect to it based on whatever is defined in
access-list 10.

Now, after you have that configured, you went and did the following:
line vty 0
no login
no password
transport input none
...

You would have only four interfaces you could ssh into. You didn't delete
vty 0, you just restricted it. It still exists as it did before.

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